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Standard VII
Mathematics
Question

If the class marks of a frequency distribution are 20,25,30,35,40 and 45, find the classes and their width.
  1. 17.5−22.5,22.5−27.5,27.5−32.5,32.5−37.5,37.5−42.5,42.5−47.5
    Width of the class is 5
  2. 17−22,22.5−27.5,28−32.5,33−37.5,38−42.5,43−47.5
    Width of the class is 7
  3. 16−23,23−28.5,278−32,32−38,38−43,43−48
    Width of the class is 5
  4. None of these

A
16−23,23−28.5,278−32,32−38,38−43,43−48
Width of the class is 5
B
17.5−22.5,22.5−27.5,27.5−32.5,32.5−37.5,37.5−42.5,42.5−47.5
Width of the class is 5
C
17−22,22.5−27.5,28−32.5,33−37.5,38−42.5,43−47.5
Width of the class is 7
D
None of these
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Solution
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If the class marks of a frequency distribution are 20,25,30,35,40 and 45, then the width of the class is 25−20=5.

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Similar Questions
Q1
If the class marks of a frequency distribution are 20,25,30,35,40 and 45, find the classes and their width.
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Q2

(i) Find the class mark of the class 90-120.
(ii) In a frequency distribution, the mid-value of the class is 10 and width of the class is 6. Find the lower limit of the class.
(iii) The width of each of five continuous classes in a frequency distribution is 5 and lower class limit of the lowest class is 10. What is the upper class limit of the highest class?
(iv) The class marks of a frequency distribution are 15, 20, 25, .... Find the class corresponding to the class mark 20.
(v) In the class intervals 10-20, 20-30, find the class in which 20 is included.


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Q3

(i) Find the class mark of the class 90-120.
(ii) In a frequency distribution, the mid-value of the class is 10 and width of the class is 6. Find the lower limit of the class.
(iii) The width of each of five continuous classes in a frequency distribution is 5 and lower class limit of the lowest class is 10. What is the upper class limit of the highest class?
(iv) The class marks of a frequency distribution are 15, 20, 25, .... Find the class corresponding to the class mark 20.
(v) In the class intervals 10-20, 20-30, find the class in which 20 is included.

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Q4
The class marks of a distribution are 11, 14, 17, 20, 23, 26 and 29. Find the width of the class .
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Q5
The width of five continuous classes in a frequency distribution is 5 and the lower class limit of the lowest class is 10. Find the upper class limit of the highest class.
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